Study On Preparation Of Tripartite Quantum Steering Optical Fields Based On Optical Superlattices

Like quantum entanglement,quantum steering correlation has the advantage of surpassing the classical information processing capabilities.Different from quantum entanglement,it has a unique asymmetry and can perform unidirectional and directional quantum manipulation.Through the studies of this thesis,it will be possible to provide simple and feasible experimental schemes for the experimental preparation of quantum steering correlated optical fields with tripartite different frequencies and will also explore the physical mechanisms underlying the generation of quantum steering correlation.The study of these complex quantum correlation properties will open up new avenues for various novel applications of quantum technology in the future,thereby promoting the application and development of quantum information processing.This thesis focuses on the important direction of quantum steering,and has carried out studies in the following areas:1.A study on the tripartite quantum steering correlation among the output optical fields in a third-harmonic nonlinear process generated by the cascaded sum-frequency.The quasi-phase-matching(QPM)technique is used to generate the third-harmonic through the cascaded sum-frequency process.Based on the criterion of multipartite quantum steering correlation,the quantum steering correlation among the fundamental,second-and third-harmonic generated in the cascaded sum-frequency process is theoretically demonstrated and its relationship with the pump power,the non-linear coupling coefficient and the loss constant of the cavity is discussed.2.A study on the tripartite quantum steering among the output optical fields in the fourth-harmonic nonlinear process generated by the cascaded double-frequency.In an optical superlattice,the fourth-harmonic is generated by two double-frequency processes.The tripartite quantum steering correlation among the pump,second-and fourthharmonic is theoretically demonstrated based on the criterion of multipartite quantum steering correlation.In addition,the variation of the tripartite quantum steering correlation properties with the nonlinear parameters of the system is discussed.3.A study on the tripartite quantum steering correlation properties of the spontaneous parametric down-conversion cascaded a sum-frequency process.First,the threshold characteristics of this cascaded nonlinear process are analyzed and it is found that the system has a stable state only below and without threshold.Based on the criterion of multipartite quantum steering correlation,the tripartite quantum steering correlation properties of the cascaded nonlinear process are analyzed and discussed below and without threshold,respectively.It is theoretically demonstrated that the genuine tripartite quantum steering correlation properties exist in this cascaded non-linear process in both cases.